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https://issues.apache.org/jira/browse/CAMEL-24874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-24874.
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Resolution: Fixed
> camel-core-languages - catalog: add the simple init block operators := and
> ~:= (simple.json) and fix the init block doc section
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-24874
> URL: https://issues.apache.org/jira/browse/CAMEL-24874
> Project: Camel
> Issue Type: Improvement
> Components: camel-core, camel-jbang
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Priority: Major
> Fix For: 4.23.0
>
>
> The simple language gained init blocks with local variables ({{$name :=
> <exp>;}}), local custom functions ({{$name ~:= ${trim()} ~>
> ${uppercase()};}}) and the chain operator {{~>}} (see
> https://camel.apache.org/blog/2026/09/camel-simple-customfunction/). The
> catalog ({{simple.json}}, generated from {{SimpleOperatorConstants}}) has
> {{~>}} and {{?~>}} with examples, but no operator entry for {{:=}} and
> {{~:=}}, so nothing that reads the catalog knows they exist:
> {{camel_catalog_doc simple}} / {{tui_catalog_doc}} (function and operator
> lists, {{optionsFilter}}), the generated JS validator, the MCP server and any
> external agent that fetches the catalog. The docs are the only place, and
> {{docPage=advanced}} is the whole 24 KB simple-advanced page.
> Scope:
> * add {{:=}} and {{~:=}} as operators with description, syntax and examples
> in {{SimpleOperatorConstants}} (kind {{init}}), regenerate the catalog
> * fix the init block section of simple-advanced.adoc: the unfinished sentence
> 'You can also declare custom functions using', 'a lso', '$nane'
> Out of scope (decided 2026-09-21): an always-on primer line in the TUI system
> prompt / {{CatalogDocs.SIMPLE_SYNTAX}} and special-casing of init blocks in
> {{AnswerChecks}}. These cost tokens on every turn for every user for a
> feature a local-model user asks for rarely, and there is no observed
> local-model failure with init blocks yet; the catalog entry is fetched only
> when asked. Revisit if a transcript shows the failure. The validator gap for
> multi-line simple expressions is CAMEL-24875.
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